Title :
A novel control method for dual mode time-sharing grid-connected inverter
Author :
Wu, Weimin ; Geng, Houlai ; Geng, Pan ; Ye, Yinzhong ; Chen, Min
Author_Institution :
Dept. of Electr. Eng., Shanghai Maritime Univ., Shanghai, China
Abstract :
A dual mode time-sharing inverter has higher efficiency than other type grid-connected inverter due to only one power stage of it working in high frequency state at any time. In this paper, small signal modeling of this inverter is carried out, which reveals that the control-to-grid current transfer function of this inverter has a right half plane zero at low frequency during the “Boost” operating stage which results in the difficulty in controlling the system. An indirect current control method based on instantaneous power balance is proposed. The right-half plane zero can be eliminated and a satisfactory compensator with enough phase margin and amplitude margin can be obtained with this new control strategy. And it is evaluated through simulation and experimental results of a 1kW prototype.
Keywords :
compensation; electric current control; invertors; power grids; power system interconnection; transfer functions; amplitude margin; compensation; dual mode time-sharing inverter; grid-connected inverter; indirect current control method; phase margin; transfer function; Bridge circuits; Choppers; Equations; Inverters; Mathematical model; Switches; Transfer functions; Small-signal-model; Time-sharing operation; dual mode control; full-bridge inverter; grid-connected; instantaneous power balance;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2010 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-5286-6
Electronic_ISBN :
978-1-4244-5287-3
DOI :
10.1109/ECCE.2010.5618077
